How long does cheesecake last?

How long would a cheesecake last in my fridge? We have half of a Cheesecake Shop strawberry cheesecake left over from yesterday (Xmas) which was bought in the morning. We aren't going to be able to eat what's left but we are supposed to be catching up with friends on Friday for a bbq lunch- would this cheesecake be okay for then?? I would hate to see it wasted. But that would mean it would be 3 days old and of course I won't risk it with friends!